Explores scientific breakthroughs leading to understanding of life. See plant and animal life at Yellowstone National Park, how the microscope studies microorganisms. Dramatic re-creation of the discovery of archaea, and late 19th century discoveries; cell division, sex cells, cell differentiation. Also, mitochondria, how cells convert to sugars, the Krebs cycle, photosynthesis, the discovery of the ecosystem process and more.

Title on screen: The Science Channel's 100 greatest discoveries. DVD features: video index, standards link, teacher resources. Title from container.